無法在NodeJS中模擬ES6匯入的函式

我一直在嘗試模擬fetchLiveMatches匯入的函式，但沒有成功。我一直在瀏覽一些想法，但我想我已經用完了，所以我可以使用一些幫助。關于我做錯了什么的任何想法？

live.test.js

import * as liveController from "./live";
import { jest } from "@jest/globals";
import * as liveService from "../service/live";
import { buildReq, buildRes, buildNext } from "../utils/testingHelper";

jest.mock("../service/live");

beforeEach(() => {
  jest.clearAllMocks();
});

describe("Live Controller", () => {
  test("calls fetchLiveMatches function to fetch from external API", async () => {
    const req = buildReq();
    const res = buildRes();
    const next = buildNext();

    await liveController.getLiveMatches(req, res, next);

    expect(next).not.toHaveBeenCalled();
    expect(liveService.fetchLiveMatches).toHaveBeenCalled();
    expect(res.status).toHaveBeenCalledWith(500);
    expect(res.status).toHaveBeenCalledTimes(1);
  });
});

服務/live.js

import axios from "axios";

async function fetchLiveMatches() {
  // Some hidden code

  return axios({
    method: "get",
    url: `${API_FOOTBALL_BASE_URL}${GET_EVENTS}${MATCH_LIVE}${WIDGET_KEY}${TIMEZONE}${DETAILS}`,
    headers: {}
  }).then(res => res.data);
}

export { fetchLiveMatches };

jest.config.js

export default {
  testEnvironment: "jest-environment-node",
  transform: {}
};

包.json

{
  "name": "server",
  "version": "1.0.0",
  "main": "index.js",
  "type": "module",
  "license": "MIT",
  "dependencies": {
    "express": "^4.18.2"
  },
  "devDependencies": {
    "axios": "^1.1.3",
    "eslint": "^8.26.0",
    "jest": "^29.2.2",
    "prettier": "^2.7.1"
  },
  "scripts": {
    "start": "node --watch index.js",
    "start:no-watch": "node index.js",
    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch"
  }
}

測驗錯誤輸出

Live Controller ? calls fetchLiveMatches function to fetch from external API
                                                                                 
    expect(received).toHaveBeenCalled()                                          
                                                                                 
    Matcher error: received value must be a mock or spy function                 
                                                                                 
    Received has type:  function
    Received has value: [Function fetchLiveMatches]

uj5u.com熱心網友回復：

只需發布我為最終面臨相同問題的任何人找到的解決方案：

首先，由于我在沒有 Babel 的情況下使用 ES6/模塊匯入，因此我將模擬函式更改為unstable_mockModule，然后根據檔案，我決定在模擬模塊后嘗試在測驗范圍內動態匯入。

如果您使用 ES 模塊匯入，那么您通常傾向于將匯入陳述句放在測驗檔案的頂部。但通常你需要在模塊使用之前指示 Jest 使用模擬。出于這個原因，Jest 會自動將 jest.mock 呼叫提升到模塊的頂部（在任何匯入之前）。要了解有關此內容的更多資訊并查看它的實際效果，請參閱此 repo。

測驗組件使用以下代碼：

import { jest } from "@jest/globals";
import { buildReq, buildRes, buildNext } from "../utils/testingHelper";

describe("Live Controller", () => {
  test("calls fetchLiveMatches function to fetch from external API", async () => {
    jest.unstable_mockModule("../service/live", () => ({
      fetchLiveMatches: jest.fn(() => [])
    }));

    const { getLiveMatches } = await import("./live");
    const { fetchLiveMatches } = await import("../service/live");

    const req = buildReq();
    const res = buildRes();
    const next = buildNext(msg => console.log(msg));

    await getLiveMatches(req, res, next);

    expect(fetchLiveMatches).toHaveBeenCalled();
    expect(res.status).toHaveBeenCalledWith(200);
    expect(res.status).toHaveBeenCalledTimes(1);
  });
});

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